dojo小例子（25）在循环结束后再执行后续语句

var deferred = new Deferred();
var index = 0;
results.forEach(function( item ){ //results是数组
index ++;
if( index === results.length - 1 ){
deferred.resolve(index);
}

});

deferred.then(function(last){

if( last ){
button.hidden = false;
}else{
button.hidden = true;
}
});